Calculating machine



Aug. 10, 1937. E. c. WALTER 2,089,820

CALCULATING MACHINE Filed Jan. 22, 1936 INVENTOR.

Edg /ard alter W W ATTORNEY.

. Patented Aug. 10, 1937 UNITED STATES PATENT OFFICE Monroe CalculatingMachine Company,

Orange, N. J., a corporation of Delaware Application January 22, 1936,Serial No. 60,176

Claims.

The invention has relation to calculating machines, and moreparticularly to tens carry mechanism therefor, the present applicationbeing a continuation in part of application Serial No.

5 21,724, filed May 16, 1935. The invention consists n the novelconstruction and combination of parts as set forth in the appendedclaims.

In the accompanying drawing, illustrating the invention:

Fig. 1 is a vertical sectional view through the carry mechanism andassociated parts, the members being shown in normal position of rest,with the carry elements restored to inactive position.

Fig. 1a.- is a detail fragmentary section, showing the carry settingspring. 7

Fig. 2 is a plan view of a carry mechanism with the parts shown in thepositions assumed in transferring a unit to a higher order numeralwheel. I

Fig. 3 is a sectional view, taken on the line 3-3 of Fig. 1, showing thecarry elements in inactive position.

Fig. 4 is a similar view, showing a modifiedform of carry dog.

In this drawing the invention is illustrated as applied to a machine ofthe Monroe type, illustrated in United States Patent No. 1,474,230,granted to E. F. Britten, Jr. on November 13, 1923. In this machine thedifferentially set actuators and the tens carryelements are mounted uponseparate shafts which shafts are rotated in one direction for performingpositive or additive calculations and in the opposite direction forperforming negative or subtractive calculations. The

tens carry mechanismis of the pre-set type.

In the drawing, the numeral I designates a numeral wheel, of which aseries is provided, mounted upon the shaft 2, and each having fasttherewith a pinion 3, adapted to mesh with an wintermediate gear I,which gear is operated by the differentially set actuators and by thetens tarry mechanism. Each wheel 3 is provided with a projection 5 lyingin the plane of a tooth 6 of a settable carry member I pivoted at 8 upona supporting shaft and provided with a toggle spring 9 adapted to holdthe member I in either of two set positions; with the tooth 5 in thepath of movement of the projection 5, or upon displacement of the memberI by projection I to hold an oppositely beveled surface [2 of member lin depressed position. There is a settable member '1 related to eachactive numeral wheel I of the machine.

Upon the drive shaft [3 are splined a series of circumferentiallychanneled sleeves I, each sleeve being provided with two radial notchesin which are mounted two pivotal dogs I 5 extending longitudinally ofshaft l3, one of said dogs acting to transmit the carry to the nexthigher wheel in additive operations and the other in subtractiveoperations. The additive and subtractive carry dogs l5 of the series ofsleeves M are angularly offset from one another, to form two opposedspiral series of dogs, in the well-known manner.

Preferably each pair of dogs I5 is secured upon the sleeve II by anannular spring I6, seated in a channel of the sleeve and passing througha perforation intermediate the ends of the dogs I5. In Figs. 2 and 3this spring is shown as helically wound, but a segmental clip spring I0may be employed as illustrated in Fig. 4. A similar annular helicalspring I! is seated in a second channel of the sleeve, and engages theouter edges of the dogs l5 to hold them normally in inactive position.If tightly wound, spring I! will lie upon the top of the dog, as shownin Figs. 2 and 3 while if loosely wound, the dog will enter between thecoils, as in Fig. 4.

Each dog I5 is comprised of two diametrically opposite arms, one armbeing carried, in the rotation of shaft l3, past the place occupied bythe beveled surface I! when the related member 1 is heldin activeposition, this arm of the dog being depressed by the action of the camsurface, the opposite arm being thereby raised into position to engagebetween the teeth of the intermediate gear 4 related to the next higherorder numeral wheel. The dog is held in engaging position while passingthrough the gear, so that one step of movement is imparted to the higherorder wheel, after which the dog, passing beyond the surface II, will beretracted by its spring ll.

Double beveled tooth 20, formed upon the sleeve ll will engage a pin 2|of member I, aetingto cam the member into fully raised position.

A dog I5 having been rocked into active position and brought intocontact with a tooth of gear 4, there will be a reactive tendencyagainst the .yieldable toggle spring 9. A large part of this reactivethrust, however, is taken up by friction, since the dog will be rockedsidewise, by contact with the gear tooth, into engagement with theopposite shoulders of the radial notch of the sleeve in which the dog ismounted. Springs 9, therefore, need not be stiff enough to provide undueresistance to movement of member 1.

It is to be noted that the dogs l5 are pivoted at points lying in theplane of the pitch diameter of gears 4, hence the dogs engage the teethof the gears by a radial movement. this meshing being possible beforethe intermediate gears have come fully to rest, without interferencebetween the dog and the tooth of the gear. It is also to be noted thatin high speed operation, with the dogs 5 l5 of the spiral seriesseparated from each other by a very slight angular displacement aboutshaft l3, a dog l5 may be engaged between the teeth of the relatedintermediate gear while the settable member 1 is being moved downagainst the opposite end of the dog. Because of this latter arrangement,permitting the dogs IE to be separated from one another angularly by avery slight distance, they may be mounted close to the driving shaft l3,having, as shown, the same radial extent as the differentially setactuators 22 of the machine. This will obviously reduce the peripheralspeed of the dogs I5 and consequently will reduce the speed of theentire carry movement.

I claim: 4

1. In a tens carry mechanism for calculating machines, the combinationwith numeral wheels provided with projections, gears related to saidwheels, and a settable member adapted to be displaced by a projection asthe related wheel 25 moves between 9 and 0 registering position; of

a drive shaft, and an intermediately pivoted do comprising diametricallyopposed arms mounted for rotation with said shaft, engageable at the endof one arm by the settable member and adapted to be rocked by a numeralwheel in movement transmitted through said member, to move its oppositearm radially of and into position to contact the gear related to thenumeral wheel of next higher order. 2. In a tens carry mechanism forcalculating machines, the combination with numeral wheels provided withprojections, gears related to said wheels, a settable member adapted tobe displaced by a projection as the related wheel moves between 9 and 0registering position, and spring means acting to hold said memberyieldably in either of two positions; of a drive shaft, a sleeve fixedupon said shaft and having opposed shoulders, and a dog pivotallymounted upon said sleeve at a point in the plane of the pitch diameterof said gears and extending longitudinally of the shaft between saidshoulders, said dog being engageable by the settable member and movablethereby radially of and into position to contact the gear related to thenumeral wheel of next higher order,

3. In a tens carry mechanism for calculating machines, the combinationwith numeral wheels provided with projections, gears related to saidwheels, and a settable member adapted to be displaced by a projection asthe related wheel moves between 9 and 0 registering position; of a driveshaft, a pivoted dog mounted for rotation with said shaft, engageable bythe settable member and movable thereby radially of and into position tocontact the gear related to the numeral wheel of next higher order, andan annular spring surrounding said shaft and engaging the dog, to resistradial movement thereof.

4. In a tens carry mechanism for calculating machines, the combinationwith numeral wheels provided with projections, gears related to saidwheels, and a settable member adapted to be displaced by a projection asthe related wheel moves between 9 andgl) registering position; of adrive shaft, two pivoted dogs mounted for rotation with said shaft inthe same plane, engageable by the settable member and movable therebyradially of and into position to'contact the gear related to the numeralwheel of next higher order, and an annular spring surrounding said shaftand engaging both said dogs, to resist radial movement thereof.

5. In a tens carry mechanism for calculating machines, the combinationwith numeral wheels provided with projections, gears related to saidwheels, and a settable member adapted to be displaced by a projection asthe related wheel moves between 9 and 0 registering position; of a driveshaft, a circumferentially channeled radially notched sleeve fixed uponsaid shaft, a perforated dog mounted in the notch of said sleeve, anannular spring seated in a channel of said sleeve and passing throughthe perforation of said dog, and a second annular spring seated in achannel of said sleeve and engaging the dog, to resist rocking movementthereof, said dog being engageable by the settable member and adapted tobe rocked thereby radially of and into position to contact the gearrelated to the numeral wheel of next higher order.

EDWARD C. WALTER.

